Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d09c5f96f2364f…

MALICIOUS

PDF

77.1 KB Created: 2021-04-28 11:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc7d77f584948810662b8a7bfa47a633 SHA-1: 988103ad21f2fe4191ab297bda7b420e0730968f SHA-256: 48d09c5f96f2364fc2957d39db3272857b5a4192d654a6a2c850d6677b1a7495
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=what+does+the+triangle+mean+on+my+printer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459941/normal_6034931497f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_60318876e6177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5fe4a277909c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_6051eed87f9dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_60642c430d6f7.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/ibghkVK/bowling_alley_near_me_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fd2c6c781d39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_5fe1cea114de9.pdfIn PDF document text
    • https://cdn.sqhk.co/puviponapib/fibW2Ul/aerobics_exercise_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_603158d295894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412887/normal_5fcff56611a52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_edcb64db9c534302b8e57275577e3a97.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_4452134999bf49c1ae0c575dba6c6cf9.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_a7cc0c6e7fa94a7a9698855465198f6f.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_3db2f3dffe4b48f9a7b3f5da4781e1e1.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_3563fc35de154372881a5c6df5854a46.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_ff515ab83f224a5cb6710b045cdd37b9.pdf?index=trueIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_62d4fe87e5e34a11ac71bb16a6376f38.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 5488 bytes
SHA-256: f97a509db973d0ea990cb8a0f4b4c8e08fe77b9fe26ed7edd383b28f76b60a02
font_02_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 11500 bytes
SHA-256: 891ac992bb210c42a1b8f981f4103e523e8edb50b3cbfc038556c842b5b91b42